Question

In a solid AB having the NaCl structure, 'A' atom occupies the comers of the cubic unit cell If all the face-centred atoms along one of the axis are removed, then the resultant stoichiometry of the solid is

(a)  AB₂

(b)  A₂B

(c)  A₄B₃

(d)  A₃B₄

Answer 1

Correct option  (d) (d)  A₃B₄

Explanation:

After the removal of all face-centred atoms along one axis. the effective number of A^- = 8 x 1/8 + 4 x 1/2

= 3

Effective number of B⁺ = 4 Thus, the formula of compound is A₃B₄.